US1933301A - Process for the treatment of metals - Google Patents

Process for the treatment of metals Download PDF

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Publication number
US1933301A
US1933301A US586081A US58608132A US1933301A US 1933301 A US1933301 A US 1933301A US 586081 A US586081 A US 586081A US 58608132 A US58608132 A US 58608132A US 1933301 A US1933301 A US 1933301A
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US
United States
Prior art keywords
treatment
metals
aluminum
coating
ammonium
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Expired - Lifetime
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US586081A
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Auerbach Rudolf
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General Electric Co
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General Electric Co
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Publication date
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used

Definitions

  • a coating of this kind is rendered particularly advantageous if certain catalyzing agents are added in small quantities to the solutions or baths employed. These catalyzing agents accelerate the oxidation process and produce a homogeneous coating.
  • the salts of iron, of copper and particularly the combinations of. via-- nadium have shown themselves to be particularly suitable.
  • the composition of the bath for forming the coating may be a known .one, for instance an aqueous solution of ammonium phosphate, ammonium borate and so on. A solution of this kind may accordingly have the 0011113051. tion:
  • the leakage current of the insulation, the condenser and the electrolytic valve is lessened approximately one-tenth.
  • the leakage current when aluminum thus treated is used as an electrode in dry rectifiers, for example in combination with copper sulphide. It is furthermore possible to add the vanadium to the aluminum in small quantities as a constituent part of an alloy, by which, among other things, its corrosion-proof quality is increased.
  • a bath for the anodic treatment of aluminum which contains approximately, 10% ammonium phosphate and 0.1% ammonium vanadate.

Description

Patented a, 31, 1933 UNITED STATES PATENT OFFICE PROCESS FOR THE TREATMENT OF METALS No Drawing, Application January ll, 1932, Serial No. 586,081, and in Germany January 23, 1931 1 Claim.
It is known that some metals, more particularly aluminum, take on an insulating oxide coating in the air and on anodie treatment. The phenomenon is exploited technically in the production of electrolytic condensers and in the production of coatings of all kinds for protection against corrosion and for electrical insulation. The object of the various treatments is to obtain a homogeneous oxide coating.
It has been found that the production of a coating of this kind is rendered particularly advantageous if certain catalyzing agents are added in small quantities to the solutions or baths employed. These catalyzing agents accelerate the oxidation process and produce a homogeneous coating. As such additions, the salts of iron, of copper and particularly the combinations of. via-- nadium, have shown themselves to be particularly suitable. The composition of the bath for forming the coating may be a known .one, for instance an aqueous solution of ammonium phosphate, ammonium borate and so on. A solution of this kind may accordingly have the 0011113051. tion:
10% ammonium phosphate 0.1% ammonium vanadate Water, glycerine and the like can be taken as the liquid medium.
By this addition, the leakage current of the insulation, the condenser and the electrolytic valve is lessened approximately one-tenth. The same is true for the leakage current when aluminum thus treated is used as an electrode in dry rectifiers, for example in combination with copper sulphide. It is furthermore possible to add the vanadium to the aluminum in small quantities as a constituent part of an alloy, by which, among other things, its corrosion-proof quality is increased.
What I claim as new and desire to secure by Letters Patent oi theUnited States, is:
A bath for the anodic treatment of aluminum which contains approximately, 10% ammonium phosphate and 0.1% ammonium vanadate.
BUDOLF AUERBACH.
US586081A 1931-01-23 1932-01-11 Process for the treatment of metals Expired - Lifetime US1933301A (en)

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Application Number Priority Date Filing Date Title
DE1933301X 1931-01-23

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US1933301A true US1933301A (en) 1933-10-31

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743527C (en) * 1937-09-22 1944-03-31 Ig Farbenindustrie Ag Process for the production of protective layers on light metals and light metal alloys
US2495941A (en) * 1946-12-18 1950-01-31 Reynolds Metals Co Electroplating copper on aluminum
DE763172C (en) * 1937-05-26 1953-05-11 Ver Alluminium Werke A G Process for the production of smooth and shiny surfaces on objects made of aluminum and aluminum alloys
US3126503A (en) * 1964-03-24 Electrical capacitor and electrode
US3658662A (en) * 1969-01-21 1972-04-25 Durolith Corp Corrosion resistant metallic plates particularly useful as support members for photo-lithographic plates and the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126503A (en) * 1964-03-24 Electrical capacitor and electrode
DE763172C (en) * 1937-05-26 1953-05-11 Ver Alluminium Werke A G Process for the production of smooth and shiny surfaces on objects made of aluminum and aluminum alloys
DE743527C (en) * 1937-09-22 1944-03-31 Ig Farbenindustrie Ag Process for the production of protective layers on light metals and light metal alloys
US2495941A (en) * 1946-12-18 1950-01-31 Reynolds Metals Co Electroplating copper on aluminum
US3658662A (en) * 1969-01-21 1972-04-25 Durolith Corp Corrosion resistant metallic plates particularly useful as support members for photo-lithographic plates and the like

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